The launch, reported by South Korean media, was confirmed by South Korea's Defense Ministry.

Pyongyang says it is entitled to launch a satellite into space but critics say the rocket development is aimed at nurturing the kind of technology needed to mount a nuclear warhead on a long-range missile.

North Korea is banned from conducting missile and nuclear-related tests under U.N. sanctions imposed after its 2006 and 2009 nuclear tests.

The latest launch comes after a failed attempt in April that fizzled less than two minutes after blast-off.

Japan and South Korea put their armed forces on alert prior to the launch. The rocket is scheduled to pass between the Korean peninsula and China, with a second stage splashing down off the Philippines before launching the satellite into orbit.

"My religious belief teaches me to feel as safe in battle as in bed. God has fixed the time for my death. I do not concern myself about that, but to be always ready, no matter when it may overtake me. ... That is the way all men should live, and then all would be equally brave." - General Thomas Jonathan "Stonewall" Jackson